Shares of the company were up 0.6 percent in premarket trading after closing at $5.15 on Monday.

Wireless carriers have been going after each others' subscribers with discounts and attractive incentives as they try to increase revenue in a highly competitive, nearly saturated market.

Sprint said it added 1.2 million new customers, the highest in about three years, on a net basis in the quarter, compared with a net loss of 383,000 customers last year.

Sprint's net loss widened to $224 million, or 6 cents per share, in the three months ended March 31 from $151 million, or 4 cents per share, a year earlier.

This was in line with analysts' estimates of a loss of 6 cents per share, according to Thomson Reuters I/B/E/S.

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The company, which is 80 percent owned by Japan's SoftBank Corp, said net operating revenue fell to $8.3 billion from $8.88 billion. This was slightly below analysts' revenue forecast of $8.43 billion.

Postpaid churn, or the rate of customer defections, was 1.84 percent, down from 2.3 percent last quarter.

It forecast 2015 adjusted earnings before interest, taxes, depreciation and amortization (EBITDA) between $6.5 billion and $6.9 billion.It expects capital expenditures of approximately $5 billion, excluding the impact of leased devices sold through indirect channels. (Reporting by Malathi Nayak in New York and Supantha Mukherjee in Bengaluru; Editing by Saumyadeb Chakrabarty and Chizu Nomiyama)